调频振子-液体联合水平减振的流固耦合机理研究  

Fluid-Structure Interaction Analysis of Vibration Suppression by Tuned Oscillator-Liquid Combined System

作　　者：郭涛[1] 管志成[1] 孙光普[1] 李国君[1] 

机构地区：[1]西安交通大学热流科学与工程教育部重点实验室,西安710049

出　　处：《西安交通大学学报》2016年第1期28-33,66,共7页Journal of Xi'an Jiaotong University

摘　　要：为了解决晃荡液体在大幅值的水平加速度激励下不再具有稳定自由晃荡频率且无法满足调频条件而导致减振能力明显下降的问题,提出了一种将调频振子置入晃荡液体中构成联合系统的减振方法。采用分离求解隐式耦合的方法对忽略结构阻尼的联合系统衰减结构振动进行了数值模拟,计算结果表明,联合系统能够在保持振子共振吸能的基础上充分利用液体晃荡对振动能量进行耗散,具有优于单纯调频质量减振或晃荡液体减振的性能。联合系统在液体晃荡时的减振作用优于液体无法晃荡时的情况;液体自由晃荡频率远离振动频率有助于振子保持共振吸能能力。在共振的容器中和振子的激励下液体晃荡具有强烈的耗能作用,这是联合系统减振的主要机理。根据这一机理,在保证振子共振和增强液体耗能作用的思路下对联合系统进行了优化,优化后联合系统即使忽略结构阻尼,阻尼比也可达到5.6%。The ability of sloshing liquid to suppress vibration is weakened in the case of large motivating acceleration due to the inconstant free sloshing frequency.A combined system where a tuned spring oscillator is put into the sloshing liquid damper is presented.The vibration suppressing process of the structure with the combined system is numerically simulated with an implicit coupling approach of partitioned solvers.The results show that the combined system is endowed with greater ability to suppress vibration because of the dissipating effect of sloshing liquid as keeping the oscillator resonant absorbing ability.A large difference of the free frequencies between sloshing and oscillator is benefit to keep the tuned condition.The liquid sloshing is simultaneously motivated by resonant container and oscillator to enhance dissipating ability,which is considered as the main suppressing mechanism of the combined system.Following the frame that enhancing the liquid dissipating as keeping the oscillator tuned,the damping ratio even gets up to 5.6%in the optimized combined system without damping structure.

关 键 词：调频振子 晃荡液体 水平减振 流固耦合 数值模拟 

分 类 号：O328[理学—一般力学与力学基础] TP391.9[理学—力学]